package com.t282.crm.config.shiro;

import com.t282.crm.entity.Right;
import com.t282.crm.entity.Role;
import com.t282.crm.entity.User;
import com.t282.crm.service.RoleService;
import com.t282.crm.service.UserService;
import org.apache.shiro.SecurityUtils;
import org.apache.shiro.authc.*;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheManager;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.subject.PrincipalCollection;
import org.apache.shiro.util.ByteSource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.ValueOperations;

import javax.annotation.Resource;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;

public class MyShiroRealm extends AuthorizingRealm {    //安全数据源

    @Resource
    private UserService userService;
    @Resource
    private RoleService roleService;

    @Resource
    private StringRedisTemplate stringRedisTemplate;
    //redis中数据的key前缀
    private String SHIRO_LOGIN_COUNT = "shiro_login_count_"; //登录计数
    private String SHIRO_IS_LOCK = "shiro_is_lock_"; //锁定用户登录

    @Override
    protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principalCollection) {
        System.out.println("调用MyShiroRealm.doGetAuthorizationInfo获取权限信息");
        //获得权限信息
        User user = (User) principalCollection.getPrimaryPrincipal();
        SimpleAuthorizationInfo info = new SimpleAuthorizationInfo();
        //静态授权：授予主体（用户）相应的角色和权限
        /*info.addRole(user.getRole().getRoleName());
        info.addStringPermission("用户列表");   //所有用户拥有“用户列表权限”
        if("管理员".equals(user.getRole().getRoleName())){ //管理员拥有“增删改权限”
            info.addStringPermission("用户添加");
            info.addStringPermission("用户编辑");
            info.addStringPermission("用户删除");
        }*/
        //动态授权
        //Role role = user.getRole();
        Role role = roleService.findRoleByUsers(user);
        if(role != null){
            info.addRole(user.getRole().getRoleName());
            //Set<Right> rights = role.getRights();
            List<Right> rights = roleService.findRightsByRole(role);
            if(rights != null && rights.size() > 0){
                for (Right right : rights) {
                    info.addStringPermission(right.getRightCode());
                }
            }
        }
        return info;
    }

    @Override
    protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {
        System.out.println("调用MyShiroRealm.doGetAuthenticationInfo获取身份信息！");
        //获得身份信息
        UsernamePasswordToken token = (UsernamePasswordToken) authenticationToken;

        String usrName = token.getUsername();

        //每次访问，登录次数+1
        ValueOperations<String,String> opsForValue = stringRedisTemplate.opsForValue();
        opsForValue.increment(SHIRO_LOGIN_COUNT+usrName,1);
        //计数大于5时，设置用户被锁定一小时，清空登录计数
        if(Integer.parseInt(opsForValue.get(SHIRO_LOGIN_COUNT+usrName)) > 5){
            opsForValue.set(SHIRO_IS_LOCK+usrName,"LOCK");
            stringRedisTemplate.expire(SHIRO_IS_LOCK+usrName,1, TimeUnit.HOURS);

            stringRedisTemplate.delete(SHIRO_LOGIN_COUNT+usrName);  //清空登录计数
        }
        if("LOCK".equals(opsForValue.get(SHIRO_IS_LOCK+usrName))){
            throw new DisabledAccountException();
        }

        User user = userService.getUserByUsrName(usrName);
        if(user == null){
            throw new UnknownAccountException();    //账号错误
        }
        if(user.getUsrFlag() == null || user.getUsrFlag().intValue() == 0){
            throw new LockedAccountException();     //账号锁定
        }
        SimpleAuthenticationInfo info = new SimpleAuthenticationInfo(
                user,//身份（根据用户名查询数据库获得用户）
                user.getUsrPassword(),//凭证（查询数据库获得的密码）
                ByteSource.Util.bytes("czkt"),//加密使用salt
                getName()//Realm对象的名称
        );
        //获得身份信息
        assertCredentialsMatch(token,info);//方法对token中的密码和info中的密码进行判断，认证失败抛出异常
        //返回身份信息
        return info;
    }

    //清空当前认证用户的权限缓存
    public void clearMyCachedAuthorizationInfo(){
        clearCachedAuthorizationInfo(SecurityUtils.getSubject().getPrincipals());
    }

    //清空所有用户权限缓存
    public void clearAllCachedAuthorizationInfo(){
        if(this.isAuthorizationCachingEnabled()){   //权限缓存是否可用
            Cache<Object,AuthorizationInfo> cache = null;
            CacheManager cacheManager = this.getCacheManager();
            if(cacheManager != null){
                String cacheName = this.getAuthenticationCacheName();   //获得权限缓存名称
                cache = cacheManager.getCache(cacheName);   //获得权限缓存
            }
            if(cache != null){
                cache.clear();  //清空
            }
        }
    }
}
